Scourability of weak rock in the Oregon Coast Range Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cv43p044f

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  • The undermining of bridge foundations can lead to either costly repairs or a bridge collapse. These foundations must be designed to counter the effects of scour. Current practice does not allow for accurate estimates of scour in erodible rock. Scour in rock can be related to geotechnical and hydraulic properties. A field study of eleven bridge sites provided samples of the bedrock where the abrasive resistance of the rock was determined and hydraulic properties of the channel were calculated. Laboratory abrasion resistance values from a modified slake durability test and hydraulic variables such as stream power were compared to recent and past stream channel cross-sections. A preliminary model has been proposed wherein the degradation of the stream channel is related to the abrasive resistance of the bedrock and the area under the daily stream power. This method provides an estimate of the degradation of the stream bed due to abrasion by bedload and flood events, not necessarily local or contraction scour.
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  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-20T18:12:08Z (GMT) No. of bitstreams: 1 BaillieMichaelW1998.pdf: 4014877 bytes, checksum: 7420c35fb3edd3b0d6f2bdefaa0551f0 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-20T18:15:39Z (GMT) No. of bitstreams: 1 BaillieMichaelW1998.pdf: 4014877 bytes, checksum: 7420c35fb3edd3b0d6f2bdefaa0551f0 (MD5)
  • description.provenance : Submitted by John Valentino (valentjo@onid.orst.edu) on 2012-09-19T23:13:30Z No. of bitstreams: 1 BaillieMichaelW1998.pdf: 4014877 bytes, checksum: 7420c35fb3edd3b0d6f2bdefaa0551f0 (MD5)
  • description.provenance : Made available in DSpace on 2012-09-20T18:15:39Z (GMT). No. of bitstreams: 1 BaillieMichaelW1998.pdf: 4014877 bytes, checksum: 7420c35fb3edd3b0d6f2bdefaa0551f0 (MD5) Previous issue date: 1998-01-28

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